From: Dave Jiang <dave.jiang@intel.com>
To: linux-cxl@vger.kernel.org, linux-perf-users@vger.kernel.org
Cc: jic23@kernel.org, will@kernel.org, mark.rutland@arm.com,
dave@stgolabs.net, sashiko-bot@kernel.org
Subject: [PATCH 1/9] perf/cxl: Program the requested event group on configurable counters
Date: Tue, 28 Jul 2026 14:05:43 -0700 [thread overview]
Message-ID: <20260728210551.2449093-2-dave.jiang@intel.com> (raw)
In-Reply-To: <20260728210551.2449093-1-dave.jiang@intel.com>
cxl_pmu_get_event_idx() sets *counter_idx for a configurable counter but
never sets *event_idx, so hwc->event_base stays 0 and cxl_pmu_event_start()
programs event group 0 regardless of the group the user requested.
Return the matched capability's event_idx.
Fixes: 5d7107c72796 ("perf: CXL Performance Monitoring Unit driver")
Reported-by: sashiko-bot@kernel.org
Closes: https://sashiko.dev/#/patchset/20260715191454.459673-1-dave@stgolabs.net?part=1
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
drivers/perf/cxl_pmu.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
index 68a54d97d2a8..e77c0650a7eb 100644
--- a/drivers/perf/cxl_pmu.c
+++ b/drivers/perf/cxl_pmu.c
@@ -552,6 +552,8 @@ static int cxl_pmu_get_event_idx(struct perf_event *event, int *counter_idx,
return -EINVAL;
*counter_idx = i;
+ if (event_idx)
+ *event_idx = pmu_ev->event_idx;
return 0;
}
--
2.55.0
next prev parent reply other threads:[~2026-07-28 21:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-28 21:05 [PATCH 0/9] perf/cxlpmu: Misc sashiko raised issues fixes Dave Jiang
2026-07-28 21:05 ` Dave Jiang [this message]
2026-07-28 21:32 ` [PATCH 1/9] perf/cxl: Program the requested event group on configurable counters sashiko-bot
2026-07-28 21:05 ` [PATCH 2/9] perf/cxl: Clear stale event fields before reprogramming a counter Dave Jiang
2026-07-28 21:26 ` sashiko-bot
2026-07-28 21:05 ` [PATCH 3/9] perf/cxl: Drop bogus counter overflow fixup Dave Jiang
2026-07-28 21:14 ` sashiko-bot
2026-07-29 0:27 ` Dave Jiang
2026-07-28 21:05 ` [PATCH 4/9] perf/cxl: Accept an overflow interrupt on MSI message number 0 Dave Jiang
2026-07-28 21:05 ` [PATCH 5/9] perf/cxl: Keep the overflow interrupt pinned to the managed CPU Dave Jiang
2026-07-28 21:29 ` sashiko-bot
2026-07-28 21:05 ` [PATCH 6/9] perf/cxl: Unfreeze counters after handling an overflow interrupt Dave Jiang
2026-07-28 21:05 ` [PATCH 7/9] perf/cxl: Validate the hardware-reported counter width Dave Jiang
2026-07-28 21:05 ` [PATCH 8/9] perf/cxl: Don't use pmu.dev in IRQ and hotplug callbacks after unregister Dave Jiang
2026-07-28 21:05 ` [PATCH 9/9] perf/cxl: Avoid cpumask_of(-1) when no CPU is assigned Dave Jiang
2026-07-28 21:31 ` sashiko-bot
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